No, she's definitely a balloon molly and not a Poecilia sphenops. Balloon mollies are derived from Poecilia latipinna.Watching again your molly I think it isn't a balloon but a "simple" molly (Poecilia sphenops) that is pregnant.
Also from the angle this photo has been taken, youy clearly see the bodyshape that belongs to a balloon molly. It doesn't show a regular bodyshape. She does show the hump on the back. Not all balloon mollies wil develop an exceptional high back. But this one does show a hump, to repeat myself. It's clearly to be seen in this photo. And it's really short bodied. I know my way out with mollies. Take a good look at the photo again...I disagree. Molly balloon shows a prominent dorsal bump that Caleb545's doesn't show at all.
Look at body differences :
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I would have to agree and say this is definitely a Balloon Molly she has all the classic signs.Also from the angle this photo has been taken, youy clearly see the bodyshape that belongs to a balloon molly. It doesn't show a regular bodyshape. She does show the hump on the back. Not all balloon mollies wil develop an exceptional high back. But this one does show a hump, to repeat myself. It's clearly to be seen in this photo. And it's really short bodied. I know my way out with mollies. Take a good look at the photo again...